Boiler



Feb. 14, 1939. J R. M GulNEss BOILER Filed July 9, 1957 INVENTOR.

ATTORNEY.

Patented Feb. 14, 1939 UNITED STATES PATENT OFFICE 3 Claims.

My invention relates to a new and useful improvement in a boiler inwhich there is utilized both water tubes and fire tubes and theinvention has for its object the provision of a boiler which will besimple in structure, economical of manufacture, durable, compact andhighly eflicient in use.

Another object of the invention is the provision of a boiler so arrangedand constructed that the upper ends of vertically extended water tubeswill be first subjected to the hot gases which will be forced to traveldownwardly around the vertically extended fire tubes so that efficiencyis provided for rapid steaming.

" Another object of the invention is the provision of a constructionwhereby, the hot gases after passing around the water tubes are forcedto pass around fire tubes thus utilizing the hot gases to the maximumextent.

Another object of the invention is the provision of a boiler soconstructed and arranged that violent disturbances in the water tubesmay be avoided.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of partshereinafter described and claimed.

The invention will be best understood by a reference to the accompanyingdrawing which 39 forms a part of this specification, and in which,

Fig. 1 is a longitudinal, vertical, central, sectional view of theinvention.

Fig. 2 is a sectional view taken on line 22 of Fig. 1.

35 Fig. 3 is a fragmentary, sectional View taken on line 33 of Fig. 1.

As shown in the drawing, the boiler comprises an inner casing having afront 1, a back 8 and an intermediary wall forming portion 9. The

40 back 8 is rearwardly ofiset or angularly turned as at 9 and thenceturned downwardly to provide the portion III, the lower end of which isflanged at H. The lower edge of the front I as well as the intermediaryportion is flanged at I2, these 45 flanges engaging against and beingwelded to the outer casing embodying the back l3, the front I4 and theshell or intermediary portion IS. The

inner casing and the outer casingare spaced apart.

The space 16 between the fronts I and I4 being comparatively shallow andthe space I! between the back l3 and the portion In also beingcomparatively shallow to provide water legs. The intermediary or shellforming portion 9 is of less length than the shell forming portion I 5so u that there is a compartment or enlarged space I8 between the backs8 and I3. Suitable stay bolts I!) serve to connect the inner shell withthe outer shell. The space or compartment 29 above the inner shell orcasing provides a steam dome from which the steam outlet pipe leads. The5 back 13 is turned inwardly, adjacent its upper end as at 22, andthence vertically to provide the vertically extended portion 23 and thusform a smoke box 24 from which extends the outlet flue 25. The front I 4is braced by the stay rods or 10 brace bolts 28 and the portion 23 isbraced by the stay rods or brace bolts 21. Water tubes having thevertically directed portion 28 projecting through the upper portion ofthe shell or inner casing 9 to communicate with the compartment 15 20.These water tubes are angularly turned at their lower ends to providethe horizontally directed or angularly turned portion 29, these tubesprojecting through the portion In to communicate with the water leg IT.The front wall [4 is 20 provided with the opening 38 communicating withthe ash pit 3| and with the opening 32 communicating with the fire boxor combustion chamber 33, the grates being located as indicated indotted lines as at 34. Projecting upwardly from the bot- 25 tom 35 ofthe boiler is a bridge wall support 36 supporting a transverselydirected angle iron 3'! on which a bridge wall or baffle 38 rests. Thisbridge wall is normally inclined to the vertical as shown in Fig. 1 andrests against the angle irons 39 which are secured to the shell 9 of theinner casing.

Traversing the space l8 are the fire tubes 40 which project through theportion 9 of the inner casing and through the portion 22 of the outercasing so as to establish communication between the interior of theinner casing 9 and the smoke box 24. The construction is such that theheated gases are forced to pass over the top of the bridge wall 9 thuscoming into contact with the water tubes 28 adjacent their upper ends.These hot gases then travel downwardly around the vertical portion ofthe tubes 28 and then around the horizontally turned portion and thenceupwardly through the fire tubes 40 into the smoke box 24 and thenceoutwardly through the flue 25. The smoke box is positioned below thewater level so that the bottom and a portion of the rear thereof is incontact with the water which fills the space I8. In this way, a violentdisturbance of the water in the water tubes is avoided as the heatedgases travel downwardly along the vertical extended portions 28. Due tothe fact that the heated gases are brought into contact with a maximumheating area the efficiency of the de- 5 vice is raised to a high degreeand a very efficient boiler is provided especially adapted for use forheating purposes.

A hot water coil 43 is positioned in the steam dome 24 with one portionthereof below the normal water level of the boiler. An inlet waterdelivery pipe 44 communicates with the water leg H. The entire boiler isprovided with a cover 45 which serves to retain the usual insulation inposition.

With a boiler constructed in this manner, an eflicient, compact,economical, durable structure is provided.

While I have illustrated and described the pre ferred form ofconstruction, I do not wish to limit myself to the precise details ofstructure shown, but desire to avail myself of such variations andmodifications as may come within the. scope of the appended claims.

What I claim as new is:

1. A boiler of the class described, comprising: an outer casing; aninner casing positioned within and spaced from said outer casing toprovide a water-tight compartment; a plurality of water tubescommunicating at their opposite ends with said water compartment, oneend of said tubes communicating with said water compartment adjacent thetop thereof and the other end communicating with said water compartmentadjacent the bottom thereof, said tubes being angularly turnedintermediate their ends to provide a vertically extending portion and ahorizontally projected portion; a bridge wall positioned in front of thevertically directed portion of said tubes for deflecting the heatinggases toward the upper end of said tubes, the path of travel of saidheating gases being along said tubes and outwardly from said innercasing adjacent the horizontally directed portion of said tubes; and aplurality of fire tubes communicating with said inner casing adjacentthe horizontally directed portion of said water tubes and projectingoutwardly of said outer casing adjacent the upper end thereof, said firetubes extending throughout their length in said water compartment.

2. A boiler of the class described, comprising:

an outer casing; an inner casing positioned within and spaced from saidouter casing to provide a water compartment; a plurality of water tubescommunicating at one end through the top of said inner casing with saidwater compartment and at their opposite ends through the rear of saidcasing adjacent the bottom thereof with said water compartment, saidtubes being angularly turned intermediate their ends to provide avertically directed portion and a horizontally directed portion; abridge wall positioned in front of said water tubes for deflecting theheating gases toward the upper end of the vertically directed portion ofsaid water tubes, there being provided a passage for said heated gasesextending downwardly from the upper ends of said water tubes andoutwardly of said inner casing adjacent the horizontally turned portionof said water tubes; and a plurality of fire tubes extending throughsaid water compartment and adapted for conducting the heating gasesoutwardly of said casings from adjacent the horizontally directedportion of said water tubes.

3. A boiler of the class described, comprising: an outer casing; aninner casing positioned within and spaced from said outer casing toprovide a water-tight compartment; a plurality of water tubescommunicating at their opposite ends with said water compartment, oneend of said tubes communicating with said water compartment adjacent thetop thereof and the other end communicatin with said water compartmentadjacent the bottom thereof, said tubes being angularly turnedintermediate their ends to provide a vertically extending portion and anangularly turned portion; and a plurality of fire tubes communicatingwith said inner casing adjacent the angularly turned portion of saidtubes and projecting upwardly and outwardly of said outer casingadjacent the upper end thereof, said fire tubes extending through saidwater compartment and serving as a means for conducting the heated gasesfrom adjacent the ends of said angularly turned portions of said tubesoutwardly from said inner casing.

JAMES R. MCGUINESS.

